Multiple CI workflow improvements

[kelson42]

• Use latest version of kiwix-build CI images
• Add macos12 and macos13 to CI
• Use latest version of actions/setup-python and Python 3.9 (in place of 3.7) for macOS

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (66371fa) 27.49% compared to head (a32caad) 27.49%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #382 +/- ## ======================================= Coverage 27.49% 27.49% ======================================= Files 26 26 Lines 2550 2550 Branches 1356 1356 ======================================= Hits 701 701 Misses 1368 1368 Partials 481 481 ```

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[kelson42]

@mgautierfr I don't get why it does not compile on macos12 and macos13. Do you? Why?

[mgautierfr]

We were using the deprecated osx name for the platform. This is now fixed. (And I also removed theses archives from the server)